I have just arrived back home this morning from my first ever solo trip (7 nights) and I LOVED IT!!!
The worst part for me was the flying - I'm from the UK and the volcanic ash situation totally freaked me out, flying out the flight was another 2 hours long due to bypassing the ash, coming back was normal, however, looks like UK airspace is going to close again in the next 24-48 hours so I'm so very glad I made it home. I was however a little apprehensive, however, the moment I stepped onto the Magical Express that all disappeared.
I had made lots of plans before I left home but you know what, most of that went out the window. My first morning there I was up really early (due to the time difference) and just hopped on the first bus that came along, it was MK and I saw the opening ceremony for the first time. I stood crying with emotion and I didn't care who saw me lol
Generally people were really friendly, I had a lot of people ask if I wanted my picture taken, I also did the photo pass.
I strolled around Epcot many times, resting, people watching, having a great time. I also ate solo, my favourite was the Flying Fish sitting at the chef's counter, great fun.
Go along with an open mind and you'll have fun

I'm doing another solo trip next year I loved it so much this year.